em0 hangs without any messages like "Watchdog timeout", only down/up reset it.

[Lev Serebryakov]

Hello, Freebsd-stable.


  My em0 (the same, copy'n'paste hardware info from previous
  mnessage):

em0 at pci0:0:25:0:        class=0x020000 card=0x82681043 chip=0x10bd8086 rev=0x02 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Intel 82566DM Gigabit Ethernet Adapter (82566DM)'
    class      = network
    subclass   = ethernet
    bar   [10] = type Memory, range 32, base 0xfea40000, size 131072, enabled
    bar   [14] = type Memory, range 32, base 0xfea79000, size 4096, enabled
    bar   [18] = type I/O Port, range 32, base 0xdc00, size 32, enabled
    cap 01[c8] = powerspec 2  supports D0 D3  current D0
    cap 05[d0] = MSI supports 1 message, 64 bit
    cap 09[e0] = vendor (length 6) Intel cap 2 version 0

It is on-board LAN on Q35-based MoBo (ASUS P5E-VM DO)

  It hangs under load without any output. When it works with POLLING, it
prints "Watchdog timeout" and reset automatically several times a day,
but without POLLING it simply hangs with same frequency. It is
8.2-PRERELEASE (from RELENG_8), cvsupped AFTER 22 Jan (last commit to
e1000 drivers family).

  Locally system works, but mbufs are overfilled. "ifconfig em0 down
&& ifconfig em0 up" solves problem.

 Output of different diagnostic tools (vmstat, netstat, ifconfig,
sysctl of dev.em.0 tree, top -S) are attached in one file.

  Early (about half year ago) this sytem works without any problems
 with net.

-- 
// Black Lion AKA Lev Serebryakov <lev at FreeBSD.org>
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